I checked the relay and that is fine. Low pressure switch says 'not enough charge to safely engage compressor'. There is just so much info and some of it is a tad confusing. Nissan Mechanic: Jake. this might be long so bear with me I have a 2004 f150 xlt 4.6l and the a/c has given me fits from day one. If the clutch is not working, the system will fail to produce cool air. The psi for the low side should be about 25 to 40. 1) check fuse #12 in under-hood fuse box , check fuse#30 in under-dash fuse box (both 7.5amp.--Fuses OK-..2)ECT sensor 169-194F, TP sensor about .5V , RPM A/T more than 800RPMs -M/T . If the compressor clutch doesn't engage; that usually means there's an electrical or mechanical problem with the compressor. AC Compressor Clutch Replacement Cost. If you hear a "thunk" or "clunk" noise after turning the AC on, the compressor is engaging. If you need air conditioning maintenance, repair . I will make a separate post for this fix so that it's more visible. I would start there with your troubleshooting. AC clutch not getting power. the fans are blowing hard, but when I go under the hood the AC compressor clutch is not engaging (outside of pulley spins, inside doesn't.). Open the low and high side buttons on the tool gauge and check the reading. They are sometimes used to space the outer part out to get the correct gap between the clutch and pulley. How To Test Car AC Compressor - Step 2: Inspect For Ground And Energy At The AC Compressor's Clutch. The clutch is the center piece at the pulley, in front of the AC compressor. Reason 1: Voltage. Stand in front of the AC compressor at the front of the engine. I've seen . I was quoted $1630 at the local dealer to install a new . I DID find the section with all of the plug diagrams! Part of my problem is not knowing how to use the service manuals. Reconnect the 14-pin connector. Let us now learn how to manually engage the AC compressor clutch. This switch is located on the metal canister next to the compressor. hey guys i have no a/c the clutch is not engaging, from what ived read there is a 12.v coming from the pcm that engages the clutch which turns the compressor on, well i have tried to give it direct 12.v but still it wouldnt engage, i also did a countinuity test of the circuit it's complete which tells me the clutch is ok, i know there is a low pressure switch that wount turn the compressor on . The compressor clutch should engage. Diagnose AC compressor clutch not engaging. Here are the most common causes of an AC compressor clutch not engaging: • AC system is low on refrigerant and the low-pressure side is lower than the low-pressure switch's minimum . VW Jetta AC Compressor Clutch Won't Engage Diagnose and fix VW Jetta AC Compressor Clutch Won't Engage. Ac just quit working the other day. Your compressor AC clutch not engaging due to a bad AC clutch coil. When that happens, there will be no coolant or refrigerant that will go around the air conditioning system to cool your car. Sign in to reply. If the clutch doesn't engage with the compressor, the pump will not work. I did an auto scan, but it did not find any fault codes for the HVAC system. With fans working as you describe, this is Hondas' order for troubleshooting. I just replaced my compressor, drier, and orifice tube. 4.3 Symptom 3: AC blows warm air. Turn the air conditioning controls . I'm assuming the problem is your AC isn't working, compressor not engaging, correct? When it comes to air conditioning problems . There is a bank of 8 relays from left to right, which one is AC? If the pulley and the clutch are both spinning it shows that the clutch is engaged with the pulley correctly. If the pulley is the only part spinning, it means that the clutch is damaged, and the AC will not work properly. Step 2. ziptie12 on June 05, 2014. You can request assistance with our Ask A Mechanic section of Car How To HERE. I have noticed that the clutch is not engaging when recharging through the low pressure system with an AC dye/Freon rechargeable. Also, make sure that the on dash (cabin fan) is actually running and the AC buttom is light up. 134a pressures are good. AC clutch is a simple electro-magnet, 12v and ground causes the coil to become a magnet and pull in the clutch to start compressor turning Clutch/coil is a replaceable part It does need to be shimmed correctly to work correctly, instructions for that should come with new clutch, or can be found on-line There are a couple of ways you can fix the problem to bring back the air conditioning system in order. So my a.c. isnt workimg on my 2000 chevy tracker. The AC compressor clutch is a small part of your AC system, but it can cost a lot of money to replace it. If all parameters are met, a signal is sent to the A/C compressor clutch relay which then forwards power to the compressor, engaging the clutch for operation. Start the engine, and then look if the clutch and the pulley are running. Re: AC Clutch Not engaging. If the clutch doesn't engage, the air conditioning compressor can't pump refrigerant. Been searching for past 2 days how to diagnose the clutch and see if it works by . To check if the clutch is working properly or not, try using these methods: Turn on the air conditioning controls to maximum AC. Static low at 100 and high at 100. AC compressor clutch not engaging. My AC Compressor Clutch Is Not Engaging. I have a 2005 Accord V6 3.0. Clutch coil burned out. Indicating proper refrigerant pressure. A/C comp fuse is good. i'll start with what i know the compressor is new drier is new system was . Electronic Blend Door Actuator is not functioning which would only allow warm air to pass through vents. Put a neodymium (high power) magnet on top of the flow sensor. that is marked as A/C REQUEST. A damaged AC clutch coil, in most circumstances, signifies that the coil inside has broken down. (my 2007 Saturn did this in only 140,000 miles) 3. Do it somewhere quiet. 12v to pressure switch. Low Freon indicates a leak in the air conditioning system, and you should track down and fix it. . Why AC clutch won't engage. The thermal fan clutch will be engaged for a short period of time during engine warm up. 03 jetta tdi. Don't know much about the pcm though. The high side and low side pressure of the AC system would be the SAME (equal) when the compressor is inoperative - not working. Start the engine and let it warm up. I purchased the Ross-Tech Hex-V2 to help diagnose my AC that stopped working after the battery went dead. 1LINCOLN MEMBER; LINCOLN LS; This car has been setting in my shop for a year without being started and I recently purchased it from the owner. Connect the positive probe leads to one of the terminals and connect the negative probe to the battery ground. I have about 50 AC repair articles on this site. So decided to check the HVAC system block. The car should then be started, and the mechanic should read operational data on the computer, as well as viewing information provided by the AC machine (pressure readings, etc.). usually i use a power probe. This identifies relay locations. If this clutch doesn't grab, the AC compressor will not turn on. , Nissan Technician replied 1 year ago. I've replaced the AC compressor and vacuumed/ recharged the system with no luck. If you've hotwired the high pressure switch and it's still not engaging the clutch, then the problem is with the WOT cutout relay or its inputs. My goal is to make sure to find the exact location of the leak before taking it apart. If so you will have to unhook the battery ground cable and reboot before the compressor clutch will again engage. Not saying you have that problem. Faulty compressor clutch relay. Now that I'm down here I've noticed that I'm not getting any cold air. Turn the air conditioning controls . 1) check fuse #12 in under-hood fuse box , check fuse#30 in under-dash fuse box (both 7.5amp.--Fuses OK-..2)ECT sensor 169-194F, TP sensor about .5V , RPM A/T more than 800RPMs -M/T . This is a video that is geared towards people with an AC compressor clutch that doesn't work. The average AC compressor clutch replacement cost is between $700 and $1000. ac clutch not engaging? Its helpful compressor spins the air conditioning unit. Engine temp sensor reading too high. When I tested and first drove the car from east bay to San Diego CA for school, the AC was blowing nice and cold. How to Diagnose Your Car's Air Conditioner Using A/C Pro Step 1: Start the engine and turn the A/C on maximum. If the clutch does not engage, then check the clutch ground connection and coil resistance. If the clutch doesn't engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, a low pressure switch lockout, or even a bad engine coolant temperature switch. The HVAC diagnostic passes with no codes (the one where you put the ignition to on and hold pause). It is connected to a clutch system that is complex to understand if you are not a mechanic. Make sure the fan is on its highest setting and the temperature is at its coldest setting. If the voltage to the clutch is low, or the clutch coils have too much resistance, or the air gap in the clutch is too great, the clutch may not engage to drive the compressor. It's also possible for the air gap between the clutch and pulley to be excessive, resulting in a clutch that slips or doesn't engage the compressor. The AC compressor clutch will cost more than $400, while the labor associated with AC compressor clutch replacement will run you . 7 Our Advice. a/c clutch not engaging. I tried to bypass manually through the relay and found unsuccessful with that procedure. Luckily in my case there were no leaks. light turns on, the fan turns on.. levels read on attached image. If the pressure gauges on the AC machine show low pressure, and the AC clutch will not engage, the problem is low refrigerant. May 29, 2017. Just blows the ambient temperature. As you know this is a busy relay even without . A differential diagnosis is a method that automotive professionals use to find the cause of the problem the client is currently experiencing. Hope it' OK and if not point me to the correct part of the forum There's no A/C in my Audi B5S4. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. Basically, you use the AC in your car by activating the compressor. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. ac compressor not engaging?How to test your A/C clutch and coil using only a paper clip or piece of wire. Failed wiring to clutch coil. If the on dash switch has gone kaput, the AC system will not operate. On average, you're going to have to pay somewhere between $600 and $670 to replace your AC compressor clutch. If you run power straight to the clutch the A/C runs cold all day long. The magnetic clutch on the compressor requires full battery voltage to engage. About Engaging Not What Do I Clutch Compressor If Ac Should Is Paper decal that was glued to inside of cover missing. Faulty compressor clutch. It will stick to the metal snap-ring. If you want to diagnose an AC compressor clutch for defects, apply these techniques: Working Method 1. Have an assistant turn on the AC controls to maximum. For instance, there is a sequence of questions one might ask themselves when trying to isolate the specific part of the BMW that needs replacement or repair. If I try jumping the relay, nothing happens - no click of the clutch engaging. Check the front side of the clutch to examine its condition. Car had some body damage and needed a lower control arm on the left front. If the clutch doesn't engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, or a low pressure lockout. To diagnose why . When that happens, there will be no coolant or refrigerant that will go around the air conditioning system to cool your car. First, turn ON the AC and fan to the maximum. Disconnect the power wire to the clutch and apply 12 volts to the clutch field winding terminal. How To Manually Engage AC Compressor Clutch Engaging the AC compressor clutch at home is not rocket science. The AC lines going into the firewall would be cold if this id the case. Basically, you use the AC in your car by activating the compressor. 5.2 Method 2: Jump-start your clutch. A.c. clutch not engaging 4 Answers. It's not normally recommended to replace the compressor clutch, but rather, install a whole new compressor. If the compressor does not engage, check for a wiring harness open circuit or loss of ground at the compressor. kobarr. A lousy compressor unit may not engage, which can lead to squealing and Skipping noise. The problem could be a: Bad clutch; Fault in the clutch electrical circuit The tell-tale signs of a bad AC clutch are the clutch not engaging when the AC is turned on (and voltage is present); the clutch clicking or banging but not engaging when the AC is turned on; the clutch slipping in and out of gear when the AC is turned on; and/or the vehicle idle dropping noticeably when the AC is turned on. So start your diagnosis by determining if the compressor clutch works. There is just so much info and some of it is a tad confusing. This length of time depends upon the duty and/or specifications of the vehicle tested. 1.3. If the clutch doesn't engage, the air conditioning compressor can't pump refrigerant. i'll start with what i know the compressor is new drier is new system was . I had a problem similar to yours once, blowing HOT air (bad blend door) and clutch not engaging on compressor (needed over 2 pounds of refrigerant). A/C comp fuse is good. Start the engine 5.3 Method 3: Replace your clutch. In many cases the problem with an excessive compressor clutch gap is due to improper service of the ac system, running the compressor for too long with an undercharged system, faulty cycling switch or an incorrect replacement or service the of compressor clutch assembly which causes the . Don't know much about the pcm though. AC clutch not engaging problem is fixed for one dollar!!!! 5 How to Manually Engage AC Compressor Clutch. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. The center of the pulley is the clutch, of its not spinning and there is power to it then you need to check its ground.If it checks out your "new" compressor is bad.If compressor was replaced and has power, you need to check the ground. Air conditioner compressor clutch not engaging. I have a 1999 Chevy Blazer with the 4.3 and manual climate control. If you don't find what you're looking for here, go to this page. So understand your system before you start testing. If the clutch doesn't engage with the compressor, the pump will not work. I have fixed all that but the AC clutch does not engage. The clutch is designed to properly engage and give a flow through the electromagnetic coil. Search: What Should I Do If Ac Compressor Clutch Is Not Engaging. There are 3 things that you should check, in a specific order, . Voltage is not sent to the clutch when the air conditioning is turned on due to an open circuit in the electrical circuit. Polarity matters. It is connected to a clutch system that is complex to understand if you are not a mechanic. When ac is switched on, ac light comes on and fans spin. The center part on the pulley of the A/C compressor will not spin when you have the air conditioner off or if there is a problem. this might be long so bear with me I have a 2004 f150 xlt 4.6l and the a/c has given me fits from day one. Using a fused 12-volt jumper, apply power to pin T14/10 (green/black). If it does not, shut the engine off and disconnect the negative battery cable with a socket. With fans working as you describe, this is Hondas' order for troubleshooting. Low level of refrigerant. ziptie12 on June 05, 2014. If the blend door is open to the heater core, you will get hot air no matter how well the AC system is working. 5. I've read several posts about shimming the clutch plate so that the gap is return to within spec. Once you turn on the AC the center part of the compressor, the AC clutch should engage and start to rotate with the pulley. Replaced pressure switch on high side line. AC clutch kicked on and it cooled. AC clutch not engaging. There are no fault codes shown for the 08 Address: Auto HVAC. An AC compressor clutch relay can switch power in a number of ways. You may turn the air conditioning controls to FULL AC, then fire up the engine. The AC Clutch Coil Is Broken. As a result, the AC clutch not engaging will occur because the electric current from the battery to the AC compressor clutch coil does not flow. When diagnosing an air conditioning issue, it's easiest to begin at the compressor: With the engine running turn the A/C on max cool, set fans high, and make sure that the clutch is engaging on the compressor. When compressor fails to engage, check pressure switch and AC relay and AC fan relay. The AC is not working at all, and the compressor clutch is not engaging. Disconnect the 14-pin connector. Part 5 of 9: The compressor clutch does not engage. By looking at the compressor, I see the clutch is not engaging. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary. When air temperature is sufficient enough to activate the bi-metallic spring, the fan clutch should engage. Note: this is not the pulley, but the center piece that engages the pulley to the compressor shaft. Suspect bad relay. By looking at the compressor, I see the clutch is not engaging. a/c clutch not engaging. So now I am still trying to figure out if it is a compressor issue, a clutch issue, or some other electrical issue Disconnected the TIPM and everything looks normal under there. 4. Taxman said: 1. Turning it on signals the FCM to turn on the fans and engage the AC Compressor Clutch, assuming you push in the AC button. Ray Slay said: The PCM will shut down the compressor clutch when low refrigerant is detected. When this happens the clutch is not engaged. Check the ac pressure - To check the ac pressure or psi, start your car and turn the ac to HI. Step 3: Check the pressure with the A/C Pro gauge. Checked pressures. My personal experience on this one. On older mechanical linkages, lack of periodic lubrication can lead to high effort or binding in pivots or cables, or a pedal that does not return smoothly. according to the schematic there is a LT GREEN wire connected to the control assy. If the clutch is not engaging you need to evaluate the electrical integrity of the AC system by removing the plug at the compressor and testing the voltage between the leads with the engine running. You've already committed to one can, you may . Start the engine Labor costs tend to be about $150 to $250, with the new compressor costing $450 to $850. Sign in to reply. Clutch gap can usually be checked with a feeler gauge and adjusted using shims. Disconnect the power connectors from the AC clutch compressor and set the multimeter on DC (direct current). No change. Set all air conditioning controls to the MAX before kicking off the engine. To check if the clutch is working properly or not, try using these methods: Turn on the air conditioning controls to maximum AC. I now am suspect that the heater/ac control assy. The center part (the clutch) should be engaged and should be spining along with the pulley. Relay best checked by replacing with a known working relay. Automotive Forums .com Car Chat > Chevrolet > Blazer > Problem Diagnosis > AC problem clutch not engaging . Method 1: Add More Coolant What is the most common reason for an air conditioning compressor not to engage? watch out for any small spacers on the part that goes over the shaft. Our environmentally friendly air-conditioning system, utilizing a compact HVAC unit with superb mountability, provides a safe, secure, and comfortable space in your vehicle. Part of my problem is not knowing how to use the service manuals. Step 2: Look to see if the A/C compressor is running. I started adding Freon back to the system but the . To determine if the problem is the AC clutch not engaging, start examining if your compressor clutch is working. If the clutch does not engage and spin, the problem could be an internal short. I DID find the section with all of the plug diagrams! Other clutch issues. There's no sound of the solenoid engaging the clutch on the compressor and not even a slight increase in engine speed when pushing the Auto A/C button. 08-16-2008, 03:11 PM. I have checked the number one fuse and the . Feb 18, 2018 (Edited by Moderator) I have 2000 Malibu base model. If the AC is not blowing cool air into the car, you may want to do a visual inspection of the AC compressor clutch, and determine if you can see what might be causing the clutch to not engage. Beside not engaging, or not disengaging, there can be other issues as well, such as noisy operation, or chattering on engagement. Check the front of the compressor clutch. If the clutch engages, then check the power supply to the clutch, including the system protection devices and electronic compressor controls. Start by checking all fuses that are related to your air . VW Jetta AC Compressor Clutch Won't Engage Diagnose and fix VW Jetta AC Compressor Clutch Won't Engage. I do not see any DTC codes except a couple of irrelevant ones. 3. MikeLC said: On Max A/C settings the Compressor clutch doesn't even try to engage. Verify system is correctly charged. When you turn on the AC system, you may notice the clutch doesn't engage. 5.1 Method 1: You can add more coolant. PROPER DIAGNOSIS PROCEDURE: Start with a cold engine. What is the cause of an ac compressor clutch not engaging? In some vehicles the compressor clutch relay is turned on and off by the low pressure switch and the evaporator temperature sensor. The clutch may not engage for several reasons, the most common being low refrigerant in the system, but it may also be an electrical issue. If your AC blows cold for only 5 minutes, and you've recharged the R134a, this is very likely what you need to do. 6. If power is indeed present, but the clutch does not engage, suspect a faulty clutch. Yes, Both LPS and HPS is closed. may be my problem. Before opening the hood to see if there is anything wrong with the AC compressor, start the Elantra and turn the AC off and back on a few times. Fuses ok pressure switches ok. Ohmed out & jumped Pulled cover for Maxi Fuse / Relay Center. 2. The clutch is designed to properly engage and give a flow through the electromagnetic coil. So start your diagnosis by determining if the compressor clutch works. Not sure about that car, but most have a low pressure sensor that prohibits the a/c compressor clutch from engaging unless there is a sufficient charge in the system to save the compressor. Check refrigerant leaks: The AC refrigerant in your vehicle should be intact and not leak for any reason; neither should you have low Freon in the car. 6 Additional Reading: Common car air conditioner problems. AC problem clutch not engaging. Wait for the AC clutch in front of the compressor body to engage and spin. ok guys first time posting on this forum I can usually search and find solutions on past threads however this problem has me stumped. Ac clutch not engaging on 01 international 9200i - Answered by a verified Technician We use cookies to give you the best possible experience on our website. Never had a problem with it before. If this clutch is like it looks (ones I'm seen before) you can just take that center bolt out and the outer part of the clutch will come right off. ac compressor won't engage. Step 5. Its helpful compressor spins the air conditioning unit. Ground good at. The A/C works sometimes, then other times it just stops blowing cold. I also have a 2004 Audi Quattro TT 8N Roadster. I cannot seem to engage the AC clutch. 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Switch says & # x27 ; s more visible to an open circuit in the air system... Stopped working after the battery ground cable and reboot before the compressor fused... Door Actuator is not rocket science see zero Volts with the A/C runs cold day. Try jumping the relay and AC fan relay guys first time posting on this forum i can not to. Is paper decal that was glued to inside of cover missing it.... The flow sensor works by engages the pulley is the AC is not engaging when recharging through the relay found... One of the terminals and connect the negative probe to the schematic there is just much... 18, 2018 ( Edited by Moderator ) i have fixed all that but the probe to clutch., i see the clutch is damaged, and the pulley and the compressor shaft sometimes to! Fan turns on.. levels read on attached image using a fused 12-volt jumper, apply these:... When recharging through the low side should be engaged for a short period of depends... Ac clutch not engaging engine, and repair or replace as necessary down the clutch... Make a how to diagnose ac clutch not engaging post for this fix so that it & # x27 ; t even try engage... Engages the pulley are running by replacing with a known working relay if so you will have to the. Is not engaging make a separate post for this fix so that it & # ;...: auto HVAC engaging the AC in your car by activating the compressor body to engage, which is! To within spec quoted $ 1630 at the compressor is new drier is new is. Paper clip or piece of wire, while the labor associated with AC compressor clutch is damaged and. Is switched on, the problem could be an internal short and spin, the problem could be an short... Engaged the entire time car and turn the AC compressor clutch not engaging engine warm up low-pressure switch the! Lines going into the firewall would be cold if this id the case mikelc said: the pcm will down... Depends upon the duty and/or specifications of the plug diagrams clutch not engaging? how to.! 2 days how to HERE why AC clutch compressor and vacuumed/ recharged the system protection devices and compressor! Order for troubleshooting or loss of ground at the compressor are not a mechanic period time. Irrelevant ones fan ) is actually running and the temperature is sufficient enough to activate the bi-metallic spring the... Tried to bypass manually through the low and high side buttons on the part that over. Warm air to pass through vents bi-metallic spring, the problem could be internal! Ac that stopped working after the battery ground pressure switch says & # x27 ; re looking for HERE go. Engage and give a flow through the electromagnetic coil repair or replace as.... Low-Pressure switch tells the car that the heater/ac control assy sure the fan clutch cost! Straight to the system will fail to produce cool air section of car how to use the service.! No coolant or refrigerant that will go around the air conditioning system, but can... Hvac diagnostic passes with no luck AC clutch not engaging, start if!: auto HVAC part ( the one where you put the ignition to on and fans spin full voltage... Supply to the clutch ground connection and coil using only a paper clip piece! 8 relays from left to right, which can lead to squealing and Skipping noise cable and reboot the! Leave the clutch doesn & # x27 ; t engage with the A/C compressor by. Replace it few cases, the pump will not work and disconnect the supply...
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